Abstract
A pre-cooling two-stage 4K pulse tube refrigerator has been developed for high cooling power. A test machine was first constructed to allow efficient optimization of parameters such as the regenerator and pulse tubes volumes and selection of the regenerator material.
The first stage was separately tested before the second stage was installed. About 65 W at 60K was achieved for the first stage-about 9% of Carnot. A new regenerative material BdAlO3 (GAP) was also tested by installing it in the bottom of the second stage regenerator in the order GAP+HoCu2+Pd an optimum weight ratio of 20–25% of GAP/(GAP+HoCu2) was observed. The improvement of the cooling power associated with the use of GAP was over 20%. As a preliminary result, over 1W of cooling at 4.2K and 30W of cooling power around 45K were achieved with an input power of approximately 7.6kW and a connecting tube length of 1.5 meters.
To increase the first stage cooling power, a double-compressor phase shifter was introduced. Its operation is explained, The equivalent PV diagrams, which are derived from numerical simulations, show that it has high potential for increasing efficiency at low temperatures.
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Zhu, S., Nogawa, M., Katsuragawa, S., Ichikawa, M., Inoue, T. (2003). Performance of a 4K Pulse Tube Refrigerator And Its Improvement. In: Ross, R.G. (eds) Cryocoolers 12. Springer, Boston, MA. https://doi.org/10.1007/0-306-47919-2_41
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DOI: https://doi.org/10.1007/0-306-47919-2_41
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